JP2016051002A - Display device, light correction device, and light correction method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device and others, capable of decreasing an uneven state of light, and to provide a display device and others, capable of decreasing an uneven state of light caused by at least one of misalignment in an assembly and difference in a degradation degree of a light source.SOLUTION: A display device 10 displays an image by using light from a surface light source device 50 that emits light from a plurality of light sources, and the display device includes: a photosensor 70 disposed along a Y direction; a detection part that detects a luminance distribution of the light in the Y direction along an image display panel 30 having a back face where the surface light source device 50 is disposed, based on the light detected by the photosensor 70; and a correcting part that corrects an uneven state of light in the Y direction based on the luminance distribution.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a display device, a light correction device, and a light correction method.

  The liquid crystal display displays an image by using light from an illumination device provided on the liquid crystal panel. For this reason, the manufacturing process of a liquid crystal display includes the process of assembling the liquid crystal panel and the illumination device in alignment (for example, Patent Document 1). Patent Document 1 describes a light emitting unit of a liquid crystal panel using a plurality of light sources, for example, a light emitting diode (LED) and a light guide plate as a lighting device.

JP 2010-54936 A

  However, in the manufacture of a liquid crystal display, the positions of the liquid crystal panel and the illumination device may shift. Or the position of the some light source contained in an illuminating device may not be arrange | positioned in an appropriate position with respect to a liquid crystal panel. In this specification, such a misalignment between the position of the liquid crystal panel and the illumination device or the light source in the liquid crystal panel and the illumination device is referred to as a misalignment. When the misalignment occurs, light passing through the liquid crystal panel may be uneven. This unevenness can cause deterioration of the image displayed by the liquid crystal display.

  In addition, the lighting device may be weakened due to wear or the like. Here, in a lighting device using a plurality of light sources such as a plurality of LEDs in Patent Document 1, some light sources may be more deteriorated than other light sources. In this case, light unevenness due to the difference in the degree of deterioration of the light source occurs. This unevenness can cause deterioration of the image displayed by the liquid crystal display.

  The present disclosure has been made in view of the above-described problems, and an object thereof is to provide a display device, a light correction device, and a light correction method that can further reduce light unevenness. Alternatively, it is an object of the present invention to provide a display device, a light correction device, and a light correction method that can further reduce the unevenness of light due to at least one of the difference between the misalignment and the deterioration degree of the light source.

  One embodiment of the present invention is a display device that displays an image using light from a light-emitting unit that emits light in a planar shape using a plurality of light sources, and includes a photosensor provided along one direction along the light-emitting unit, A detection unit that detects a luminance distribution of the one-way light along the light-emitting unit based on light detected by an optical sensor; and a correction unit that corrects unevenness of the one-way light based on the luminance distribution. Prepare.

  Furthermore, as another aspect, the correction unit configures the image so as to approximate the luminance distribution in the one direction of the image obtained when the plurality of light sources in the one direction are in a predetermined arrangement. The brightness of some or all of the plurality of pixels may be adjusted.

  Furthermore, as another aspect, the correction unit may generate adjustment data for adjusting the luminance, and apply the adjustment data to an image displayed after the adjustment data is generated. .

  Furthermore, as another aspect, the correction unit may reduce the intensity of light emitted from some or all of the plurality of light sources based on the weakest light intensity in the luminance distribution.

  Furthermore, as another aspect, the detection unit may detect the luminance distribution when a cumulative lighting time of any of the plurality of light sources reaches a predetermined time.

  Furthermore, as another aspect, the plurality of light sources are provided along the one direction, and the optical sensor is at least along the light emitting unit and on a straight line along the other direction orthogonal to the one direction. Each of the plurality of light sources may be provided at a plurality of predetermined positions that exist by design and a position between the plurality of predetermined positions.

  Furthermore, as another aspect, the light intensity of the plurality of light sources may be controlled independently.

  An optical correction apparatus according to an aspect of the present invention includes: a light sensor provided along a light emitting unit that emits light in a planar shape by a plurality of light sources; and the light emitting unit based on light detected by the light sensor. , And a correction unit that corrects unevenness of the light in the one direction based on the luminance distribution.

  The light correction method according to one aspect of the present invention provides the one-direction along the light-emitting portion based on light detected by a photosensor provided along a light-emitting portion that emits light in a planar shape by a plurality of light sources. Detecting a luminance distribution of the light of the light and correcting unevenness of the light in the one direction based on the luminance distribution.

FIG. 1 is a block diagram illustrating an example of a configuration of a display device according to the present embodiment. FIG. 2 is a diagram showing a pixel array of the image display panel according to the present embodiment. FIG. 3 is a diagram illustrating an example of a pixel arrangement different from that in FIG. FIG. 4 is an explanatory diagram of the light guide plate and the sidelight light source according to the present embodiment. FIG. 5 is a side view of the display device. FIG. 6 is a plan view of the display device viewed from the screen side. FIG. 7 is a diagram illustrating an example of a relationship between an optical sensor and an assumed position of a plurality of light sources. FIG. 8 is a diagram illustrating an example of a detection result by the detection unit. FIG. 9 is a flowchart illustrating an example of the flow of adjustment data generation processing. FIG. 10 is a flowchart illustrating an example of a flow of a first correction process using adjustment data. FIG. 11 is a graph showing an example of a correspondence relationship between the cumulative lighting time of the light source and the light intensity. FIG. 12 is a flowchart illustrating an example of a flow of processing for generating initial data and deterioration handling data. FIG. 13 is a flowchart illustrating an example of the flow of the second correction process using the degradation correspondence data. FIG. 14 is a diagram illustrating an example of an electronic apparatus to which the display device according to this embodiment is applied. FIG. 15 is a diagram illustrating an example of an electronic apparatus to which the display device according to this embodiment is applied. FIG. 16 is a diagram illustrating an example of an electronic apparatus to which the display device according to this embodiment is applied. FIG. 17 is a diagram illustrating an example of an electronic apparatus to which the display device according to this embodiment is applied. FIG. 18 is a diagram illustrating an example of an electronic apparatus to which the display device according to this embodiment is applied. FIG. 19 is a diagram illustrating an example of an electronic apparatus to which the display device according to this embodiment is applied. FIG. 20 is a diagram illustrating an example of an electronic apparatus to which the display device according to this embodiment is applied. FIG. 21 is a diagram illustrating an example of an electronic apparatus to which the display device according to this embodiment is applied. FIG. 22 is a diagram illustrating an example of an electronic apparatus to which the display device according to this embodiment is applied.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. It should be noted that the disclosure is merely an example, and those skilled in the art can easily conceive of appropriate modifications while maintaining the gist of the invention are naturally included in the scope of the present invention. In addition, the drawings may be schematically represented with respect to the width, thickness, shape, and the like of each part in comparison with actual aspects for the sake of clarity of explanation, but are merely examples, and the interpretation of the present invention is not limited. It is not limited. In addition, in the present specification and each drawing, elements similar to those described above with reference to the previous drawings are denoted by the same reference numerals, and detailed description may be omitted as appropriate.

The description will be made in the following order.
1. Embodiment 2. FIG. Application Example 3 Other

<1. Embodiment>
The display device according to the present embodiment has a light emitting unit (for example, the planar light source device 50 provided on the back surface) that emits light in a planar shape by a plurality of light sources (for example, a plurality of light sources 56A, 56B,. The display device displays an image using the light of the display surface 31).

(Constitution)
FIG. 1 is a block diagram illustrating an example of a configuration of a display device according to the present embodiment. FIG. 2 is a diagram showing a pixel array of the image display panel according to the present embodiment.

  As shown in FIG. 1, the display device 10 includes a signal processing unit 20, an image display panel 30, an image display panel driving unit 40, a planar light source device 50, a planar light source device control unit 60, and an optical sensor. 70, a detection unit 80, and a storage unit 90.

  The signal processing unit 20 receives the image input signal SRGB from the image output unit 11 and sends the output signal SRGBW to each unit of the display device 10 to control the operation. The signal processing unit 20 is an arithmetic processing unit that controls operations of the image display panel 30 and the planar light source device 50. The signal processing unit 20 is connected to an image display panel driving unit 40 for driving the image display panel 30 and a planar light source device control unit 60 for driving the planar light source device 50. The signal processing unit 20 processes an input signal input from the outside to generate an output signal and a planar light source device control signal. That is, the signal processing unit 20 reproduces an input value (input signal) of the input HSV color space of the input signal in the first color, the second color, the third color, and the fourth color. It is generated by converting to a reproduction value (output signal) of the space, and the generated output signal is output to the image display panel 30. The signal processing unit 20 outputs the generated output signal to the image display panel driving unit 40 and outputs the generated planar light source device control signal to the planar light source device control unit 60.

The image display panel 30 displays an image based on the output signal SRGBW output from the signal processing unit 20. As shown in FIG. 1, the image display panel 30 has pixels 48 arranged in P ₀ × Q ₀ (P _{0 in} the row direction and Q _{0 in} the column direction) in a two-dimensional matrix (matrix). Has been. The example shown in FIG. 1 shows an example in which a plurality of pixels 48 are arranged in a matrix in an XY two-dimensional coordinate system. In this example, the row direction is the X direction and the column direction is the Y direction.

  The pixel 48 includes a first sub pixel 49R, a second sub pixel 49G, a third sub pixel 49B, and a fourth sub pixel 49W. The first sub-pixel 49R displays a first primary color (for example, red). The second subpixel 49G displays a second primary color (for example, green). The third subpixel 49B displays a third primary color (for example, blue). The fourth subpixel 49W displays a fourth color (specifically, white). As described above, the pixels 48 arranged in a matrix on the image display panel 30 include the first sub-pixel 49R that displays the first color, the second sub-pixel 49G that displays the second color, and the third color. It includes a third sub-pixel 49B for displaying and a fourth sub-pixel 49W for displaying a fourth color. The first color, the second color, the third color, and the fourth color are not limited to the first primary color, the second primary color, the third primary color, and the white color, and may be different colors such as complementary colors. The fourth sub-pixel 49W that displays the fourth color, when irradiated with the same light source lighting amount, the first sub-pixel 49R that displays the first color, the second sub-pixel 49G that displays the second color, It is preferable to be brighter than the third sub-pixel 49B that displays the third color. Hereinafter, the first sub-pixel 49R, the second sub-pixel 49G, the third sub-pixel 49B, and the fourth sub-pixel 49W are referred to as sub-pixels 49 when it is not necessary to distinguish them from each other.

More specifically, the display device 10 is a transmissive color liquid crystal display device. As shown in FIG. 2, the image display panel 30 is a color liquid crystal display panel, and a first color filter that passes the first primary color is disposed between the first sub-pixel 49R and the image observer, and the second sub-pixel is arranged. A second color filter that passes the second primary color is arranged between the pixel 49G and the image observer, and a third color filter that passes the third primary color is arranged between the third sub-pixel 49B and the image observer. ing. When white is used as the fourth color, the image display panel 30 has no color filter disposed between the fourth sub-pixel 49W and the image observer. The fourth subpixel 49W may be provided with a transparent resin layer instead of the color filter. As described above, by providing the transparent resin layer, the image display panel 30 can suppress the occurrence of a large step in the fourth subpixel 49W by not providing the color filter in the fourth subpixel 49W. When a color other than white is used as the fourth color, a color filter of that color may be arranged.
In FIG. 2, sub-pixels of the same color are arranged in the same column, but the present invention is not limited to this. FIG. 3 is a diagram illustrating an example of a pixel arrangement different from that in FIG. For example, as shown in the example of FIG. 3, among the arbitrary three columns, the first column is the first sub-pixel 49R that displays the first color, and the second column is the second sub-pixel that displays the second color. The pixel 49G may be a pixel array in which the third sub-pixel 49B displaying the third color and the fourth sub-pixel 49W displaying the fourth color are alternately arranged in the third column. Further, the color arrangement of the sub-pixels 49 in the pixel 48 in FIGS. 2 and 3 can be changed as appropriate. Moreover, you may employ | adopt colors (for example, yellow (Y) etc.) other than white as a 4th color.

  The image display panel driving unit 40 controls driving of the image display panel 30. The image display panel drive unit 40 shown in FIGS. 1 and 2 is included in the control unit of the present embodiment, and includes a signal output circuit 41 and a scanning circuit 42. The image display panel driving unit 40 holds the video signal by the signal output circuit 41 and sequentially outputs it to the image display panel 30. The signal output circuit 41 is electrically connected to the image display panel 30 through a signal line DTL. The image display panel drive unit 40 uses a scanning circuit 42 to select a subpixel in the image display panel 30 and to control a subpixel operation (light transmittance) (for example, a thin film transistor (TFT: Thin Film Transistor)). )) On and off. The scanning circuit 42 is electrically connected to the image display panel 30 by the scanning line SCL.

  The planar light source device 50 illuminates the image display panel 30 from the back. The planar light source device 50 is disposed on the back surface of the image display panel 30 and illuminates the image display panel 30 by irradiating light toward the image display panel 30. FIG. 4 is an explanatory diagram of the light guide plate and the sidelight light source according to the present embodiment. The planar light source device 50 includes a light guide plate 54 and a sidelight in which a plurality of light sources 56A, 56B,..., 56L are arranged at positions facing the entrance surface E with at least one side surface of the light guide plate 54 as the entrance surface E. A light source 52. The plurality of light sources 56A, 56B,..., 56L are, for example, light emitting diodes (LEDs) of the same color (for example, white). The plurality of light sources 56A, 56B,..., 56L are arranged along one side surface of the light guide plate 54. When the light source arrangement direction in which the light sources 56A, 56B,. Incident light from the light sources 56A, 56B,..., 56L enters the light guide plate 54 from the incident surface E in the light incident direction LX. The LX direction and the X direction and the LY direction and the Y direction coincide with each other originally, but they may not coincide with each other when a misalignment occurs.

  The planar light source device controller 60 controls the amount of light output from the planar light source device 50. Specifically, the planar light source device control unit 60 adjusts the current or duty ratio (duty ratio) supplied to the planar light source device 50 based on the planar light source device control signal SBL output from the signal processing unit 20. As a result, the amount of light (light intensity) irradiating the image display panel 30 is controlled. Then, the planar light source device controller 60 controls the current or duty ratio (duty ratio) independently for each of the plurality of light sources 56A, 56B,..., 56L shown in FIG. ,..., 56L can be controlled to control the luminance of the planar light source device 50 for each region by controlling the amount of light emitted (intensity of light). The planar light source device controller 60 of the present embodiment records the cumulative lighting time of each of the plurality of light sources.

  FIG. 5 is a side view of the display device 10. FIG. 6 is a plan view of the display device 10 as viewed from the screen side. An optical sensor 70 is provided on the display surface 31 side of the image display panel 30. The optical sensor 70 is provided along one direction (for example, the Y direction) along the light emitting unit (for example, the display surface 31 of the image display panel 30). Specifically, the optical sensor 70 includes, for example, a plurality of photodiodes 71 provided along the Y direction, but this is an example of a specific configuration of the optical sensor 70 and is not limited thereto. Any configuration that can output a signal according to the detection result of light can be appropriately changed. In addition, although the photodiode was mentioned as an example of the optical sensor 70, it is not limited to this, You may use another optical sensor.

  FIG. 7 is a diagram illustrating an example of the relationship between the optical sensor 70 and the assumed positions of a plurality of light sources. The plurality of light sources and the optical sensor 70 in the present embodiment are provided along the same one direction (for example, the Y direction). Specifically, for a plurality of (for example, twelve) light sources 56A, 56B,..., 56L assumed to be along the Y direction, the number of photosensors 70 is greater than the number of light sources (for example, 100). The photodiode 71 is provided along the Y direction. Here, a part of the number of photodiodes 71 larger than the number of light sources is partly along the light emitting unit (for example, the display surface 31 of the image display panel 30) and in the other direction (for example, the X direction) orthogonal to one direction. A plurality of light sources 56A, 56B,..., 56L are provided at a plurality of predetermined positions in the design. In other words, when each of the plurality of light sources 56A, 56B,..., 56L is in an ideal arrangement, the photodiode 71 exists at a position on the line in the X direction where each of the plurality of light sources 56A, 56B,. . Also, some of the photodiodes 71 that are larger in number than the number of light sources are partly along the light emitting portion (for example, the display surface 31 of the image display panel 30) and in another direction (for example, the X direction) orthogonal to one direction. It is provided at a position between the plurality of light sources 56A, 56B,. In other words, one or more photodiodes 71 exist between the lines in the X direction where each of the plurality of light sources 56A, 56B,. In addition, some of the photodiodes 71 may be located outside the light sources 56A and 56L at both ends in the Y direction in the Y direction. Note that the position in the X direction where the optical sensor 70 is provided is, for example, a position where the light from the planar light source device 50 reaches and is not used for displaying an image by the image display panel 30. The optical sensor 70 in the present embodiment is located between the position where the plurality of light sources 56A, 56B,..., 56L are provided and the effective display area D of the image display panel 30 in the X direction.

  The detection unit 80 detects a luminance distribution of light in one direction (for example, the Y direction) along the light emitting unit (for example, the display surface 31 of the image display panel 30) based on the light detected by the optical sensor 70. Specifically, the detection unit 80 is a circuit that is electrically connected to a plurality of photodiodes 71 constituting the optical sensor 70. The detection unit 80 detects the luminance distribution of light in the Y direction on the display surface 31 of the image display panel 30 based on the light intensity detected by each of the plurality of photodiodes 71.

  FIG. 8 is a diagram illustrating an example of a detection result by the detection unit 80. The detection unit 80 generates information indicating the luminance distribution of light. In the example shown in FIG. 8, the luminance distribution of light represented by this information is indicated by a curve graph L1. The detecting unit 80 calculates the intensity of light between the plurality of photodiodes 71 by interpolation processing, and generates this information. The detection unit 80 outputs this information to the signal processing unit 20 or the planar light source device control unit 60.

  The lighting patterns of the plurality of light sources 56A, 56B,..., 56L performed upon detection by the detection unit 80 are arbitrary. In the present embodiment, two lighting patterns of a first lighting pattern and a second lighting pattern will be described. In the first lighting pattern, all the light sources are turned on. In the second lighting pattern, each of the light sources 56A, 56B,. The first lighting pattern is performed after the display device is manufactured and before shipment, for example. The second lighting pattern is performed at a predetermined timing before and after shipment, for example. The detection unit 80 outputs information indicating the luminance distribution of the light detected according to the first lighting pattern to the signal processing unit 20. In addition, the detection unit 80 outputs information indicating the luminance distribution of the light detected according to the second lighting pattern to the planar light source device control unit 60. The signal processing unit 20 and the planar light source device control unit 60 perform different correction processes according to the information indicating the luminance distribution of the light acquired by each. Hereinafter, the correction process performed by the signal processing unit 20 is referred to as a first correction process, and the correction process performed by the planar light source device control unit 60 is referred to as a second correction process.

(First correction process)
Next, the first correction process will be described. The signal processing unit 20 may include a part of a plurality of pixels constituting an image or an approximation of a luminance distribution in a predetermined direction of an image obtained when a plurality of light sources in a predetermined direction (for example, Y direction) are in a predetermined arrangement. Adjust the overall brightness. Specifically, the signal processing unit 20 uses the light luminance distribution when a plurality of light sources are in a predetermined arrangement as an ideal model, and is represented by an ideal model of the light luminance distribution (for example, a curve graph L2 shown in FIG. 8). The ideal model) is compared with the luminance distribution of light detected by the detector 80 (for example, the luminance distribution represented by the curve graph L1 shown in FIG. 8). The signal processing unit 20 identifies a position where the light is weak or strong with respect to the ideal model in the Y direction, and adjusts the luminance of the pixels constituting the image displayed in the effective display area D based on the identified position. . Specifically, the signal processing unit 20 corrects the output signal for each pixel so as to increase the luminance of the pixel at a position where light is weaker than the ideal model. Further, the signal processing unit 20 corrects the output signal for each pixel so as to lower the luminance of the pixel at a position where light is strong relative to the ideal model. The vertical width of the pixel luminance by the signal processing unit 20 depends on the difference between the ideal model of the light luminance distribution at each position along the Y direction and the light luminance distribution detected by the detection unit 80. Thereby, the nonuniformity of the light by the assembly mismatch at the time of manufacture can be reduced. As described above, the signal processing unit 20 functions as a correction unit that corrects unevenness of light in a predetermined direction (for example, the Y direction) based on the luminance distribution of light detected by the detection unit 80. Note that the ideal model of the light brightness distribution is that the brightness distribution of each of the plurality of light sources is uniform, the positions of the plurality of light sources are equidistant from the light guide plate, and light is guided by the light guide plate. The luminance distribution in the case of being uniform is assumed.

  In the present embodiment, the luminance of the pixel 48 can be adjusted more easily by adjusting the aperture ratio of the fourth sub-pixel 49 </ b> W in the pixel 48. Specifically, the presence of the white fourth sub-pixel 49W allows light to be emitted without being absorbed by the color filter, so that the upper limit of the luminance of the pixel 48 becomes larger. That is, the vertical width of the luminance of the pixel 48 including the white fourth subpixel 49W is larger. For this reason, the signal processing unit 20 can adjust the luminance according to the unevenness of the light within the range of the upper and lower widths of the higher luminance by adjusting the aperture ratio of the white fourth sub-pixel 49W.

  In the case of the example illustrated in FIG. 8, the signal processing unit 20 performs processing for the pixel 48 corresponding to a position where light is weaker than the ideal model (curve L2), such as the positions of the light source 56A, the light source 56D, the light source 56F, and the light source 56G. The degree of light transmission is increased by increasing the aperture ratio of the fourth subpixel 49W. As a result, the intensity of light weakened with respect to the ideal model is compensated, and the luminance of pixels at positions corresponding to these light sources is corrected. On the other hand, for the pixel 48 corresponding to the position where the light is strong with respect to the ideal model, such as the light source 56E, the signal processing unit 20 reduces the aperture ratio of the fourth subpixel 49W to reduce the degree of light transmission. Make it smaller. This suppresses the intensity of light that is too strong for the ideal model, and corrects the luminance of pixels at positions corresponding to these light sources. Similarly to these pixels, the signal processing unit 20 transmits light according to the difference between the ideal model and the luminance distribution of light detected by the detection unit 80 for each pixel corresponding to the position between the light sources. Adjust the degree. The degree of adjustment of the aperture ratio of the fourth sub-pixel 49W according to the relationship between the light intensity indicated by the ideal model and the light intensity detected by the detection unit 80 is determined based on experimental results and the like performed in advance. Is done. Data indicating the adjustment amount determined based on the experimental result or the like may be held by the signal processing unit 20 or may be stored in the storage unit 90.

  The signal processing unit 20 adjusts the luminance according to the difference between the ideal model of the light luminance distribution and the light luminance distribution detected by the detection unit 80 for each position in the Y direction in the image. In other words, when there is a pixel whose luminance is adjusted at any position in the Y direction in the image, the same luminance adjustment is performed for all the pixels that are on the same straight line as this pixel in the X direction.

  The signal processing unit 20 includes data indicating the difference between the ideal model of the light luminance distribution and the light luminance distribution detected by the detection unit 80 or the ideal model of the light luminance distribution and the luminance of the light detected by the detection unit 80. Data indicating the degree of adjustment of the luminance of each pixel according to the difference from the distribution is stored in the storage unit 90 as adjustment data 92. The signal processing unit 20 stores the adjustment data 92 in the storage unit 90, and then adjusts the brightness of the image using the adjustment data 92 for all images displayed in the effective display area D. As described above, the signal processing unit 20 according to the present embodiment generates adjustment data for adjusting the luminance, and applies the adjustment data to an image displayed after the adjustment data is generated.

  The storage unit 90 is a storage device configured by, for example, a nonvolatile semiconductor memory (flash memory or the like). Data indicating the ideal model of the light luminance distribution (ideal data 91) may be stored in the storage unit 90, and cannot be rewritten to the signal processing unit 20 or a recording device accessible by the signal processing unit 20. It may be recorded.

  9 and 10 are flowcharts illustrating an example of the flow of each process related to the first correction process. FIG. 9 is a flowchart illustrating an example of the flow of the adjustment data 92 generation process. The planar light source device controller 60 turns on all the light sources (step S1). The detection unit 80 detects the luminance distribution of the light in the Y direction along the display surface 31 of the image display panel 30 based on the light detected by the optical sensor 70 (step S2). The signal processing unit 20 specifies a difference between the ideal model of the light luminance distribution and the light luminance distribution detected by the detection unit 80 (step S3). The signal processing unit 20 includes data indicating the difference between the ideal model of the light luminance distribution and the light luminance distribution detected by the detection unit 80 or the ideal model of the light luminance distribution and the luminance of the light detected by the detection unit 80. Data indicating the degree of adjustment of the luminance of each pixel according to the difference from the distribution is generated as adjustment data 92 (step S4). The signal processing unit 20 stores the generated adjustment data 92 in the storage unit 90 (step S5).

  FIG. 10 is a flowchart showing an example of the flow of the first correction process using the adjustment data 92. The signal processing unit 20 stands by until the image input signal SRGB is input from the image output unit 11 (step S11; No). When the image input signal SRGB is input from the image output unit 11 (step S11; Yes), the signal processing unit 20 reads the adjustment data 92 from the storage unit 90 (step S12). The signal processing unit 20 adjusts the brightness of the image using the adjustment data 92 (step S13).

(Second correction process)
Next, the second correction process will be described. In the second correction process, for example, data indicating the luminance distribution of the light detected by the detection unit 80 according to the first lighting pattern is stored in the storage unit 90 as the initial data 93. The initial data 93 is data indicating the light intensity of each of the plurality of light sources 56A, 56B,.

  Next, detection (confirmation detection) for confirming the degree of deterioration of the plurality of light sources when the accumulated lighting time of any of the plurality of light sources reaches a predetermined time (for example, 1000 hours) by the planar light source device controller 60. ) Is performed. Specifically, the planar light source device controller 60 turns on the plurality of light sources 56A, 56B,..., 56L with the second lighting pattern. The detection unit 80 detects the luminance distribution of each of the light sources 56A, 56B,..., 56L according to the lighting pattern, and outputs information indicating the detection result to the planar light source device control unit 60.

  FIG. 11 is a graph showing an example of a correspondence relationship between the cumulative lighting time of the light source and the light intensity. The planar light source device controller 60 has the light intensity of each of the light sources 56A, 56B,..., 56L indicated by the luminance distribution of the light obtained by the confirmation detection, and the plurality of light sources 56A, 56B indicated by the initial data 93. ,..., 56L are compared with the intensity of each light to confirm the presence or absence of a light source with weakened light. Specifically, for example, a light source whose light intensity value has decreased by a predetermined threshold value (for example, threshold value C shown in FIG. 11) or more with respect to the light intensity value (for example, intensity value A shown in FIG. 11) indicated by the initial data 93. If there is, the planar light source device control unit 60 identifies this light source as a light source with weakened light. When there is a light source in which the light is weakened, the planar light source device control unit 60 specifies the light intensity of the light source from the comparison result. The planar light source device control unit 60 adjusts the light intensities of all the light sources in accordance with the specified light weakness. Specifically, the planar light source device control unit 60 uses the light intensity of the light source with the weakest light among the light sources with weak light as a reference so that the light intensities of all the light sources are substantially the same as this reference. The light intensity of each of the plurality of light sources 56A, 56B,. As described above, the light intensity of each of the plurality of light sources (for example, the light sources 56A, 56B,..., 56L) is independently controlled. Thereafter, the planar light source device controller 60 controls the operation of all the light sources so that the light intensity is lowered according to this reference. As described above, the planar light source device control unit 60 emits light from some or all of the plurality of light sources 56A, 56B,..., 56L on the basis of the weakest light intensity in the luminance distribution of the light detected by the detection unit 80. Reduce the intensity of light produced. Thereby, the unevenness of the light due to the difference in the degree of deterioration of the light source can be reduced. As described above, the planar light source device control unit 60 functions as a correction unit that corrects unevenness of light in a predetermined direction (for example, the Y direction) based on the luminance distribution of light detected by the detection unit 80.

  The planar light source device control unit 60 is configured to control each of the plurality of light sources 56A, 56B,..., 56L based on the light intensity of the light source having the weakest light among the light sources having weakened light (light reduction condition). ) Is stored in the storage unit 90 as the degradation correspondence data 94. The planar light source device controller 60 uses the degradation correspondence data 94 in the control of the light amount of the planar light source device 50 performed after detection for confirming the degree of degradation of the plurality of light sources 56A, 56B,. Control the operation of the light source.

  Confirmation detection may be performed a plurality of times. For example, confirmation detection may be performed every time the cumulative lighting time increases by a predetermined time (for example, 1000 hours). In this case, every time confirmation detection is performed, the deterioration correspondence data 94 is updated so as to be the deterioration correspondence data 94 corresponding to the latest confirmation detection result. When confirmation detection is performed when the accumulated lighting time of any of the plurality of light sources 56A, 56B,..., 56L has reached a predetermined time, the cumulative lighting time of the other light sources thereafter becomes the predetermined time. Sometimes confirmation detection may be omitted.

  12 and 13 are flowcharts illustrating an example of the flow of each process related to the second correction process. FIG. 12 is a flowchart showing an example of the flow of processing for generating the initial data 93 and the degradation correspondence data 94. The planar light source device control unit 60 lights each of the light sources 56A, 56B,..., 56L at different timings (step S21). Based on the light detected by the optical sensor 70, the detection unit 80 detects the luminance distribution of the light in the Y direction of each of the light sources 56A, 56B,... 56L along the display surface 31 of the image display panel 30. (Step S22). The planar light source device control unit 60 generates data indicating the luminance distribution of the light detected in step S22 as initial data 93 (step S23). The planar light source device control unit 60 stores the initial data 93 in the storage unit 90 (step S24). The processing of step S21 to step S24 is performed in a state where deterioration due to wear has not yet occurred in the plurality of light sources 56A, 56B,.

  The planar light source device controller 60 records the cumulative lighting time of each of the light sources 56A, 56B,..., 56L (step S25). If the accumulated lighting time of any of the light sources 56A, 56B,..., 56L has not reached the predetermined time (step S26; No), confirmation detection is not performed, and the process proceeds to step S25. When the cumulative lighting time of any of the plurality of light sources 56A, 56B,..., 56L reaches a predetermined time (step S26; Yes), the planar light source device control unit 60 sets each of the plurality of light sources 56A, 56B,. Are turned on at different timings (step S27). Based on the light detected by the optical sensor 70, the detection unit 80 detects the luminance distribution of the light in the Y direction of each of the light sources 56A, 56B,... 56L along the display surface 31 of the image display panel 30. (Step S28). The planar light source device controller 60 compares the light luminance distribution of each of the plurality of light sources 56A, 56B,..., 56L indicated by the initial data 93 with the light luminance distribution obtained in step S28 (step S29). . The planar light source device control unit 60 determines whether there is a light source whose light has been weakened based on the comparison result of step S28 (step S30). When it is determined that there is no light source whose light has been weakened (step S30; No), the planar light source device control unit 60 ends the process related to the generation of the degradation correspondence data 94. When it is determined that there is a light source whose light has been weakened (step S30; Yes), the planar light source device control unit 60 specifies how light is weakened when there is a light source whose light has been weakened (step S31). The planar light source device control unit 60 uses the light intensity of the light source having the weakest light among the light sources having weakened light as a reference, so that the light intensities of all the light sources are substantially the same as this reference. , 56B,..., 56L, data relating to the operation control content (light reduction level) for reducing the light intensity is generated as the degradation correspondence data 94 (step S32). The planar light source device control unit 60 stores the generated degradation correspondence data 94 in the storage unit 90 (step S33).

  FIG. 13 is a flowchart showing an example of the flow of the second correction process using the degradation correspondence data 94. The planar light source device control unit 60 stands by until the planar light source device control signal SBL is input from the signal processing unit 20 (step S41; No). When the planar light source device control signal SBL is input from the signal processing unit 20 (step S41; Yes), the planar light source device control unit 60 reads the degradation correspondence data 94 from the storage unit 90 (step S42). The planar light source device control unit 60 performs operation control on the light intensity of each of the plurality of light sources 56A, 56B,..., 56L using the degradation correspondence data 94 (step S43).

  As described above, according to the present embodiment, the light detected by the optical sensor 70 provided along one direction (for example, the Y direction) along the light emitting unit (for example, the display surface 31 of the image display panel 30). Based on this, the detection unit 80 detects the luminance distribution of light in one direction along the light emitting unit, and corrects unevenness of light in one direction based on this luminance distribution. Thereby, the unevenness of light can be reduced. Further, by correcting the unevenness of the light based on the difference of the luminance distribution of the light detected by the detection unit 80 from the ideal model, the unevenness of the light due to the misalignment can be reduced. Further, when the accumulated lighting time of a plurality of light sources (for example, a plurality of light sources 56A, 56B,..., 56L) reaches a predetermined time, the light luminance distribution is detected and the unevenness of the light is corrected, thereby reducing the deterioration of the light source. Light unevenness due to the difference in degree can be further reduced.

  In addition, by adjusting the luminance of some or all of the plurality of pixels constituting the image so that it is approximated by the luminance distribution in one direction of the image obtained when a plurality of light sources in one direction are in a predetermined arrangement, Light unevenness due to a difference in light intensity due to physical factors of a plurality of light sources attached to the apparatus 10 can be reduced by adjusting the brightness of the image. In this way, unevenness of light due to misalignment can be reduced by adjusting the luminance.

  Further, by generating adjustment data (for example, adjustment data 92) for adjusting the luminance and applying the adjustment data to the image displayed after the generation of the adjustment data, the luminance distribution of the light is detected once. Thus, for all the images displayed thereafter, unevenness of light due to misalignment can be reduced by adjusting the luminance.

  Further, by reducing the intensity of light emitted from some or all of the plurality of light sources with the weakest light intensity in the luminance distribution as a reference, the light intensities of the plurality of light sources can be made substantially uniform. For this reason, the nonuniformity of light can be reduced more.

  In addition, even when there is a light source whose light has been weakened due to wear by detecting the luminance distribution when the cumulative lighting time of any of the plurality of light sources has reached a predetermined time, based on the detection result of this luminance distribution By reducing the intensity of light emitted from some or all of the plurality of light sources, the light intensity of the plurality of light sources can be made substantially uniform. For this reason, the unevenness of the light due to the difference in the degree of deterioration of the light source can be further reduced.

  In addition, the optical sensor 70 is provided at a plurality of predetermined positions where each of the plurality of light sources exists in a design along a straight line along the other direction orthogonal to one direction along the light emitting unit, so that a part of the light sensor 70 may be misaligned. Alternatively, it is possible to detect the luminance distribution of light that can change depending on whether or not all the light sources deviate from their predetermined positions with higher accuracy. Further, the light sensor 70 is provided at a position between a plurality of predetermined positions on a straight line along the light emitting unit and in the other direction orthogonal to the one direction, so that the intensity of light between the light sources can be reduced. It can be detected with higher accuracy. For this reason, the luminance distribution of light in one direction can be detected with higher accuracy. Therefore, light correction can be performed with higher accuracy based on the luminance distribution of light detected with higher accuracy.

<2. Application example>
Next, an application example of the display device 10 described in this embodiment will be described with reference to FIGS. Hereinafter, this embodiment and a modification will be described as this embodiment. 14 to 22 are diagrams illustrating examples of electronic devices to which the display device according to this embodiment is applied. The display device 10 according to the present embodiment is an electronic device in various fields such as a mobile terminal device such as a mobile phone or a smartphone, a television device, a digital camera, a notebook personal computer, a video camera, or a meter provided in a vehicle. It is possible to apply to. In other words, the display device 10 according to the present embodiment can be applied to electronic devices in all fields that display an externally input video signal or an internally generated video signal as an image or video. The electronic device includes a control device that supplies a video signal to the display device 10 and controls the operation of the display device 10.

(Application example 1)
The electronic device shown in FIG. 14 is a television device to which the display device 10 according to the present embodiment is applied. This television apparatus has, for example, a video display screen unit 510 including a front panel 511 and a filter glass 512, and the video display screen unit 510 is the display device 10 according to the present embodiment.

(Application example 2)
The electronic device shown in FIGS. 15 and 16 is a digital camera to which the display device 10 according to the present embodiment is applied. The digital camera has, for example, a flash 521, a display unit 522, a menu switch 523, and a shutter button 524, and the display unit 522 is the display device 10 according to the present embodiment. As shown in FIG. 15, this digital camera has a lens cover 525, and a photographing lens appears by sliding the lens cover 525. The digital camera can take a digital photograph by imaging light incident from the taking lens.

(Application example 3)
The electronic device shown in FIG. 17 represents the appearance of a video camera to which the display device 10 according to the present embodiment is applied. This video camera has, for example, a main body 531, a subject photographing lens 532 provided on the front side surface of the main body 531, a start / stop switch 533 during photographing, and a display 534. The display unit 534 is the display device 10 according to the present embodiment.

(Application example 4)
The electronic apparatus shown in FIG. 18 is a notebook personal computer to which the display device 10 according to this embodiment is applied. The notebook personal computer includes, for example, a main body 541, a keyboard 542 for inputting characters and the like, and a display unit 543 that displays an image. The display unit 543 is the display device 10 according to the present embodiment. is there.

(Application example 5)
The electronic device illustrated in FIGS. 19 and 20 is a mobile phone to which the display device 10 is applied. FIG. 19 is a front view of the cellular phone in the opened state. FIG. 20 is a front view of the cellular phone folded. For example, the mobile phone includes an upper housing 551 and a lower housing 552 connected by a connecting portion (hinge portion) 553, and includes a display 554, a sub-display 555, a picture light 556, and a camera 557. Yes. The display device 10 is attached to the display 554. Note that the display 554 of the mobile phone may have a function of detecting a touch operation in addition to a function of displaying an image.

(Application example 6)
The electronic device illustrated in FIG. 21 is an information portable terminal that operates as a portable computer, a multifunctional portable phone, a portable computer capable of voice communication, or a portable computer capable of communication, and may be referred to as a so-called smartphone or tablet terminal. . This information portable terminal has a display unit 562 on the surface of a housing 561, for example. The display unit 562 is the display device 10 according to the present embodiment.

(Application example 7)
FIG. 22 is a schematic configuration diagram of a meter unit according to the present embodiment. The electronic device shown in FIG. 22 is a meter unit mounted on a vehicle. A meter unit (electronic device) 570 illustrated in FIG. 22 includes a plurality of display devices 10 according to the present embodiment described above as display devices 571 such as a fuel gauge, a water temperature gauge, a speedometer, and a tachometer. The plurality of display devices 571 are all covered by a single exterior panel 572.

  Each of the display devices 571 shown in FIG. 22 has a configuration in which a panel 573 as display means and a movement mechanism as analog display means are combined with each other. The movement mechanism has a motor as driving means and a pointer 574 rotated by the motor. As shown in FIG. 22, the display device 571 can display a scale display, a warning display, etc. on the display surface of the panel 573, and the movement mechanism pointer 574 rotates on the display surface side of the panel 573. Is possible.

  In FIG. 22, a plurality of display devices 571 are provided on one exterior panel 572; however, the present invention is not limited to this. One display device 571 may be provided in a region surrounded by the exterior panel 572, and a fuel gauge, a water temperature gauge, a speedometer, a tachometer, or the like may be displayed on the display device.

<3. Other>
As described above, the present technology has been described with reference to the embodiments and application examples to the electronic apparatus. However, the present technology is not limited to these embodiments and the like, and various modifications are possible.

  In the above-described embodiment, the luminance of each pixel of the image is adjusted as correction of light unevenness due to misalignment, but this is an example of correction of light unevenness due to misalignment, and is not limited thereto. For example, based on the difference in luminance distribution of light detected by the detection unit 80 before shipment from the ideal model, the light intensity of each of the light sources 56A, 56B,. You may do it. In this case, reference data for adjusting the light intensity is stored in a storage device such as the storage unit 90, and the planar light source device control unit 60 refers to this reference data during the subsequent operation of the display device 10. May be.

  For example, in the above embodiment, the storage unit 90 used for storing the adjustment data 92, the initial data 93, the deterioration correspondence data 94, and the like is one storage unit, but this is an example of a specific form and is not limited thereto. It is not something that can be done. For example, a separate storage unit may be provided for some or all of these data.

  Further, the unit of detection and control of light intensity by each of a plurality of light sources (for example, a plurality of light sources 56A, 56B,..., 56L) is not limited to one light source. Specifically, for example, in the case where the planar light source device 50 includes a light guide plate provided so that each of a plurality of partitions arranged in parallel along the Y direction can be lit with light of an individual light source, the light source provided in each partition The number of may be one or plural. When there are a plurality of light sources provided in each section, the planar light source device control unit 60 may use a plurality of light sources for each section as one operation control unit. That is, the planar light source device control unit 60 may control the operations of a plurality of light sources for each section so that the intensity of light emitted from each section is substantially uniform. In this case, even if some of the light sources of the plurality of light sources provided in each section are weakened, the light intensity can be supplemented by other light sources existing in the same section.

  In the embodiment described above, the correction relating to the light intensity according to the relationship between the light intensity indicated by the ideal model and the light intensity detected by the detection unit 80 is performed, and the aperture ratio of the white subpixel (fourth subpixel 49W) is corrected. However, this is an example of a correction method related to the light intensity, and is not limited to this. For example, the signal processing unit 20 may correct the light intensity by adjusting one or more aperture ratios of sub-pixels of other colors. In addition, the signal processing unit 20 may correct the light intensity by adjusting the aperture ratio of a plurality of subpixels including white.

  In the above embodiment, the luminance of some or all of the plurality of pixels constituting the image is approximated by the luminance distribution in one direction of the image obtained when the plurality of light sources in one direction are in a predetermined arrangement. Although adjustment is made, this is an example of correction of unevenness of light, and is not limited to this. For example, the light unevenness may be corrected so that the luminance distribution of the light in one direction is made more uniform.

  In addition, other functions and effects brought about by the aspects described in the present embodiment, which are apparent from the description of the present specification, or can be appropriately conceived by those skilled in the art, are naturally understood to be brought about by the present invention. .

DESCRIPTION OF SYMBOLS 10 Display apparatus 20 Signal processing part 30 Image display panel 48 Pixel 49R 1st subpixel 49G 2nd subpixel 49B 3rd subpixel 49W 4th subpixel 50 Planar light source device 52 Sidelight light source 54 Light guide plate 56A, 56B, ... , 56L Light source 60 Planar light source device control unit 70 Optical sensor 80 Detection unit 90 Storage unit

Claims (9)

A display device that displays an image using light from a light emitting unit that emits light in a planar shape from a plurality of light sources,
An optical sensor provided along one direction along the light emitting unit;
A detection unit that detects a luminance distribution of the light in the one direction along the light emitting unit based on light detected by the optical sensor;
A correction unit that corrects unevenness of light in the one direction based on the luminance distribution;
A display device comprising: The correction unit may be a part or all of a plurality of pixels constituting the image so as to approximate the luminance distribution in the one direction of the image obtained when the plurality of light sources in the one direction are in a predetermined arrangement. Adjust the brightness of
The display device according to claim 1. The correction unit generates adjustment data for adjusting the luminance, and applies the adjustment data to an image displayed after the generation of the adjustment data.
The display device according to claim 2. The correction unit reduces the intensity of light emitted from some or all of the plurality of light sources with reference to the intensity of the weakest light in the luminance distribution.
The display device according to claim 1. The detection unit detects the luminance distribution when a cumulative lighting time of any of the plurality of light sources reaches a predetermined time;
The display device according to claim 4. The plurality of light sources are provided along the one direction,
The light sensor includes at least a plurality of predetermined positions where each of the plurality of light sources exists by design on a straight line along the light emitting unit and in the other direction orthogonal to the one direction, and between the plurality of predetermined positions. Provided between and
The display device according to any one of claims 1 to 5. The plurality of light sources are independently controlled in light intensity.
The display device according to any one of claims 1 to 6. A photosensor provided along one direction along a light emitting section that emits light in a planar shape by a plurality of light sources;
A detection unit that detects a luminance distribution of the light in the one direction along the light emitting unit based on light detected by the optical sensor;
A correction unit that corrects unevenness of light in the one direction based on the luminance distribution;
A light correction device comprising: Detecting the luminance distribution of the light in the one direction along the light emitting unit based on light detected by a photosensor provided along the one direction along the light emitting unit that emits light in a plane by a plurality of light sources;
Correcting light unevenness in the one direction based on the luminance distribution.

Images